【摘要】 以某288 m超高层框架-核心筒结构的减振控制为研究对象,针对该工程的自身特点提出了设置非线性粘滞阻尼器、铅粘弹性阻尼器耗能减振层的六种控制方案。在10年一遇风振作用下,利用改进的自回归AR模型模拟了结构Y方向的脉动风荷载时程,并对该结构进行了不同控制方案下的风振控制研究,同时针对该结构进行了7°小震和中震作用下的阻尼减震控制研究。对比分析了不同控制方案下耗能减振层对结构地震与风振作用的减振效果,结果表明本文提出的六种控制方案不仅能有效抑制结构的风致振动,显著改善结构的风振舒适度,对结构顶层峰值加速度响应的最大降幅达40%,而且还能提高结构在地震作用下的可靠性,进一步证明了耗能减振层对于超高层结构抗风与抗震的有效性和可行性,提出了风振与地震作用下设置耗能减振层超高层结构的分析与设计建议。更多还原

【Abstract】 Vibration control of a 288m super-tall building was studied here.Six vibration control schemes with viscous dampers and lead-viscoelastic dampers were proposed to control structural dynamic responses under wind and earthquake excitations.Fluctuating wind time series occuring one time in 10-year on the structure were simulated with a modified AR model.The dynamic responses of the structure with the proposed control schemes under wind and earthquake excitations were investigated and their vibration control effects were analyzed comparatively.The study results showed that the excessive dynamic responses induced under wind and earthquake excitations can be controlled effectively using the proposed schemes;the peak acceleration of the top story can be reduced by almost 40% using the proposed control schemes with wind excitation;the additional safety reserve of the structure under minor and major earthquakes can also be added using the proposed control schemes.So,the validity and feasibility of the proposed schemes in reducing structural vibration responses was fully approved.Some suggestions about structural analysis and design under wind and earthquake excitations were proposed.更多还原